Some comorbidities are associated with severe coronavirus disease (Covid-19) but it is unclear
whether some increase susceptibility to Covid-19. In this case-control Mexican study we …

… Hernández-Garduño, he wrote the first draft of the paper. Drs FitzGerald, Elwood,
Hernández-Garduño … Hernández-Garduño performed the statistical analysis. All authors …

Dear editor: Lung cancer (LC) is the number one cause of death among all cancers worldwide
1 and in Mexico. 2 LC mortality rates in Mexico increased for both sexes between 1970 …

To determine the effect of air pollution in Mexico City on respiratory health, patient visits for
upper respiratory tract infections were monitored in five clinics. Levels of ozone, nitrogen …

Objective: To determine prevalence trends of using Wood as the Main Cooking Fuel (WMCF)
in Mexico and household characteristics that predict its use. Materials and methods: …

Background The aim was to compare tuberculosis trends in Mexico and United States and
to evaluate Mexican diagnostic methods and contact investigation. Methods Retrospective …

Con el objeto de estudiar la influencia de las concentraciones de ozono (O3) en el exterior,
así como su comportamiento en el interior de un aula; comparamos durante cinco meses, …

Different risk factors have been identified as associated with tuberculosis (TB), an important
and common one is malnutrition, however, the causes of malnutrition have not been studied …

Los daños a la salud producidos durante una exposición aguda al monóxido de carbono (CO)
son bien conocidos. En cambio, sus efectos crónicos aún son controvertidos. El objetivo …

… In Response: We thank Hernández-Garduño and Elwood for drawing attention to the issue
of nontuberculous mycobacteria (NTM) colonization (1), which was not described in our study …